Aquarium



FIG. 1 is a front elevational view of an aquarium showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof.

The broken line representation of a fish in FIG. 1 is for purposes of illustration only. 

The ornamental design for an aquarium, substantially as shown and described. 